I bought her as a baby, she's only a few months old now. I clean her cage often and change her water every 3 days. She gets a dust bath 3 times a week. She seems healthy - climbing, curious, active - but she's missing fur around her cute little nose at first it was just a little, but now It's got some bumps. What could this be? Have I done something wrong? I really love her, she is comfortable with me and loves to ride around on my shoulder. I've put a lot of time into her.